Ments



(Np Model.) '2 sheetssheet 1.

G.' E. SGRIBNER.,Y

ANNUNGIATOR SWITCH AND TELEPHONBCIRGUIT. No. 293.197.

Patented Feb.` 5, 1884.

.Ams v (No Model.) Y 2 sheets-sheet 2.

o. E. SCRIBBIER.l ANNUNUIA'TB. SWITCH `AND TELEPHONE CIRCUIT, No.2931"97.. Patented Ffebj. 5V, 1884.

v lUrvrrnn Srarns-FPATENT Ormes.

CHARLES E. SCRIBNER, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESN E ASSIGN-MENTS, IO THE VESTERN ELECTRIC COMPANY, -OF SAME PLACE. 1

ANNUNCIATOR=SWITCH AND TELEPHONE-Cl RCUI'T.

'SPECIFICATION forming part of Letters Patent No. 293,197, datedFebruary 5, 1884.

Application 'filed December` l 2, 1F81.

.To a/ZZ wiz/0m it may concern: l

Be it known that I, OHnnLns E. SGRIBNER, of Chicago, Illinois, havediscovered a certain new and usefuL Improvement in Shutter- Switches andTelephoneCircuits, of which the following is a full, clear, concise, andexact de scription.

My invention is designed for use where several telephone-lines aregrouped at their outer ends by a common line and connected at thecentral office with the common groundwire of the listening operator, andit consists of switching devices placed at the subscribers stations andoperated by a battery from the central onice. Y

y In the drawings, Fi gure 1, I have shown four subscribers7 stations,Nos.1, 2, 3,and 4, grouped together by the common outer line, andconnected at the central4 olrice, in the usual way, with the listeningoperator7 s outtA. At station No. 1 I have shown a subscriber-s outfitin detail, as combined with my switching device.

, The bell only is shown at stations Nos. 2, 3, and

et. The line of any given station is connected directly from its switchat the central offi ce to the switch-lever of its station'. rIhus line aof station No. 1 is connected from switch b at the central office tolever c at station No. 1. Then the telephone is not in use, the circuitpasses from the lever, as shown, through the bell, and thence, asindicated by the dotted lines, through the shutter (Z of my switchingdevice to the common outer line, c. On connecting the battery `to lineby inserting the plug f in the switch, line a is cut off from the`listening operators ground-line, and the V:first impulse gf the batterymoves the-armature g, and the shutter d falls, making contact with theground-point, as shown at station No. 1'. Thesubscribers individual lineat any gigen station may thus be cut oii'' from the grouping line andconnected automatically to ground, as shown at station No. 1. Y

My switching device, as thus described, is,

tofore it has sometimes been necessary to `disconnect the whole group onaccount of trouble slot.

(No model.)

upon a single line. Incase of a cross, the current from the interferingline will immedr ately throw down the shutter of the switching device,so that the trouble will affect only the line that is in the cross.

In Fig. 2 Ihave shown a modication of myl switching device `upon thecall-box in which the annunciator-drop is operated by thearmature of thebell, instead of by the armature of a special magnet, as shown atstationNo. 1, Fig. '1. The lever shown in Fig. 2, lwhich holds the shutter ofthe annunciator, is provided with a slot at its upper end. The vibratinghammer rod' passes through this Vhen the hammer-rod begins to vibrate,its motion is communicated to the lever, and as any motion of the vleverreleases the shutter the shutter falls as the bell begins to y ring.

InFig. 3, Sheet 2, I have shown the shutter m placed on thetelephone-box inst above the lever a of my automatic switch fortelephones, described more particularly in Letters Patent No. 248,671 ofOctober 25,1881. The telephone-line c isconneeted to the switch-lever,and its circuit may be traced from the lever u, through the metallicwedge j), to the metallic pin 1', which is insulated from the frame. ofthe switch, as shown. From thence the circuit of the telephone line,passes to the magnets of the bell, (not shown in Fig. 3,) 1

and thence to the shutter` m by line s, and thence to the armature g',and thence to the special vshutter-magnet (not shown in Fig. 3) to thecommon outer line. Vhen the shutter first falls. it takes the positionindicated by the dotted lines, its lower point just resting upon thepoint o of the insulated catch. O11 withdrawing the metallic wedge orring p of the telephone from the switch the position of the lever ischanged and the shutter falls into the notch q. The subscriber is thuscompelled to replace the shutter before he can hang up the telephone.

I clainiy 1. The combination of a group'of telephonelines with any usualcentral office and subscribers outts, with switching devices, one in thecircuit of each line betweenthe .bellmagnet and common outer line,wliiereby any ICO line may be separated from Jche group and c011-subscribers station, of the shutter of au an- 1o n'ected to ground, asand for the purpose seb' nuneator, adapted to be operated by-currentforth. sent from the central office, und means where- 2. The combinationof lche auuuuciatorby the subscriber mush' replace said shutter 5Shutter with the Contact piece or catch and after a call before hangingVup the telephone.

the lever of the automatic switch, whereby the CHARLES E. SGRIBNER-subscriber is compelled to replace the shutter Vtnesses: Y 1 I Y ybefore hanging the telephone-ou the switch. VILLIAM S. (ETRANGER, A

3.` The combination, with the switch at al GEORGE l): BARTON.

